Die for cutting screw-threads.



UNITED STAlES PATENT osmosi.

T() lil. E. BRGTNE. UF

summon, WESWNSW DIE Fon cur-rms SCREW-THREADS.

Specification of Letters Patent.

Patented May 14, 190'?.

Application filed February 26, i908. Serial No` 303.1111f To f1/A wlfifom 'n2/my concern.

Be it known that l, FRANK l). RANDALL, u. citizen of the United States, residing et Wenpecc, countyT of VVsupec-e end State of Wisconsin, have invented new and usefui .improvements in Dies for Cutting Screw- Threeds, ol" which the following is s. specification.

My invention relates to improvements in sd'ustsble screw-thread cutting dies.

T e object of my invention is to provide s. form of construction in which the die members may be accurately adjusted and se curely held against variation or dispiacement during the thread cutting operation.

In the following description reference is had to the accompanying drawings, in Which,-

Figure 1 is s. pien view of e multiple thread cutting die embodying my invention. Fig. 2 is en edge view of the some showing the slots in the gege members.

Like perte ere identified by the some refer ence characters in both views. V

A and B ere the die members formed with greduetcd thread cutters C of any ordinary style. Rods D extend through apertures in the respective die members et right sngies to their meeting feces, these rods being proa vid ed with heads E engaging the members B. A age member F is adjusted to the outer siuece of the member A and is provided with slots G for the reception of the ends H of the rods D, which ere referebiy iettened where they extend into te slots G es shown in Fig. 2. Die. enel guide slots or channels J are formed m the slots of the member F at the respective sides of the siots G, end the risttened ends H of the rods D ere provided with cross-pins or iaterei projections K, which extend into the slots or channels J. The slots or channels J extend longitudinally in the member F with one end approaching and the other receding from the member A. The Wells of the slots form angular bearing surfaces for the project-ions K.

The members F and A are connected by e bolt L, which extends through a. slot M in the member F end into c screw threaded operture in the member A, wherebT the member F is permitted to move longitudineiljf.-Y along the member A.

An adjusting screw N swiveled to s. bracket O at one end of the member A hes threaded engagement with the gage member F. so that i by turning the screw N the member F wili be moved longitudinally, thus causing the meinber A to approach or recede from the member B in correspondence with the position of the ins K in the siete J.

T ie device is provided with the usuel handies R and Si, which may be attached et any suitable point to either one of the members A or B.

The members A and B ereprovided with gege merke es shown in Fig. 1, indicating the pitch or dimensions of the thread cutters C.

Having thus described my invention what I claim es new end desire to secure by Let-- ters Patent is,-d

1. in s. device ci the described class the combination of a. pair of apertured thread cutting die members, heeded rods slidingly mounted in and fitting the apertures in the die members, en edjustsbie gege member having vdiegonal bearing snrisces movebly engngmg said rods, and ineens for adjusting the gege member et sn engle to the exis of seid `rods to seperate the die members or cause them to approach each other.

2. In s. device o the described class, the combination of s. pair of thread cutting die members provided with rod receiving sperturesg, connecting guide rods slidingly mounted in and itting seid apertures; and means, common to both rods7 for simulteneousi f ed'usting the die members et both ends Wit re erenee to each other.

3. In s device of the described class, the combination of s. psir of thread cutting die members; heeded rods extending through the members end provided with lateral project-ions neer their unheeded ends; s gage member movsbiy mounted on one of the die members end provided with slots receiving seid rods; and diagonal guide ways receiving said lateral projections.

4. In e device of the described class, the

eembinetieu of a lset el' threed (cutting dies; die I'IIeIrlbers und threaded eermeetien with Io heeded reds extendmg,r through the members the gege member. end prevlded wIth latere] prejeetmns neer v[n testmmny whereof l eHiX my slgnature theIr unhended ends; It gege member Irmvm the presel'lee e'ftwe wltnesses. ably meunted en ene ef the die members und F v HANK I), It l) Il. prevlded wIth slots I'eeelvmg Saud belts," and AN A j diegene] guide ways reeeivingr Suid letel'atl \VitneSses2 Vrejeetmns; together wIth Im edjustmg screw (L/Immer: II..'I`IIUICSIII1I.L,

mfvmg swlveled eem'Im-,tlen wIth ene et the WILLIAM E. FISHER. 

